The only thing funnier than Donald Trump’s birther claims about Ted Cruz is the media’s demand that Cruz take them seriously.Trump’s suggestion that Cruz’s birth potentially presents a “precarious†situation for the GOP should Cruz become the nominee is silly. And a silly attack deserves a silly response, which Cruz delivered in the form of a tweet of the Fonz from “Happy Days†jumping the shark.However, Trump has every reason to have the word “precarious†on the brain “Precarious†means “dangerously likely to fall or collapse.†That doesn’t describe the circumstances of Cruz’s birth; it describes Trump’s inflated position that...